[INFO] updating cached repository https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 05589b16939a5f01e51d2bdd5167cc70fc0fe4f2
[INFO] checking u1roh/graph_in_rust_with_unsafe against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fu1roh%2Fgraph_in_rust_with_unsafe" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/u1roh/graph_in_rust_with_unsafe on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] finished tweaking git repo https://github.com/u1roh/graph_in_rust_with_unsafe
[INFO] tweaked toml for git repo https://github.com/u1roh/graph_in_rust_with_unsafe written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/u1roh/graph_in_rust_with_unsafe already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc2ad57222e02a725880fdc62cb3d2617ce69a2aa260002c6e137d32f539c44c
[INFO] running `"docker" "start" "-a" "dc2ad57222e02a725880fdc62cb3d2617ce69a2aa260002c6e137d32f539c44c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking mepoo v0.1.0 (https://github.com/u1roh/mepoo.git#dd29e280)
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking graph_in_rust_with_unsafe v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:322:13
[INFO] [stderr]     |
[INFO] [stderr] 322 |             unsafe {
[INFO] [stderr]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sentinel`
[INFO] [stderr]   --> src/test05_nodes_in_hashmap.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         pub fn sentinel(&self) -> *const Node<T> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut_unchecked`
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |         pub unsafe fn get_mut_unchecked(&mut self, ptr: *const Node<T>) -> Option<&mut Node<T>> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:120:9
[INFO] [stderr]     |
[INFO] [stderr] 120 |         pub fn get_mut(&mut self, ptr: *const Node<T>) -> Option<NodeMut<T>> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `tail`
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:127:9
[INFO] [stderr]     |
[INFO] [stderr] 127 |         pub fn tail(&self) -> &Node<T> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:130:9
[INFO] [stderr]     |
[INFO] [stderr] 130 |         pub fn is_empty(&self) -> bool {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_front`
[INFO] [stderr]    --> src/test05_nodes_in_hashmap.rs:155:9
[INFO] [stderr]     |
[INFO] [stderr] 155 |         pub fn push_front(&mut self, value: T) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut_unchecked`
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |         pub unsafe fn get_mut_unchecked(&mut self, ptr: Ptr<Node<T>>) -> Option<&mut Node<T>> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         pub fn get_mut(&mut self, ptr: Ptr<Node<T>>) -> Option<NodeMut<T>> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `tail`
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |         pub fn tail(&self) -> Ref<Node<T>> {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/test06_nodes_in_mepoo.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |         pub fn is_empty(&self) -> bool {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_front`
[INFO] [stderr]    --> src/test06_nodes_in_mepoo.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         pub fn push_front(&mut self, value: T) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Node`
[INFO] [stderr]  --> src/test07_nodes_in_arena.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 |     struct Node<'a, T> {
[INFO] [stderr]   |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Graph`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 |     struct Graph<'a, T> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Node`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:56:16
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub struct Node<T> {
[INFO] [stderr]    |                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Graph`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:61:16
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub struct Graph<T> {
[INFO] [stderr]    |                ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `NodeRefMut`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:66:16
[INFO] [stderr]    |
[INFO] [stderr] 66 |     pub struct NodeRefMut<'a, T>(&'a mut Node<T>);
[INFO] [stderr]    |                ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |         pub fn value(&self) -> &T {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value_mut`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:71:9
[INFO] [stderr]    |
[INFO] [stderr] 71 |         pub fn value_mut(&mut self) -> &mut T {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `other`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |         pub fn other(&mut self) -> Self {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `construct_graph`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:79:12
[INFO] [stderr]    |
[INFO] [stderr] 79 |     pub fn construct_graph() -> Graph<usize> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `other`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         pub fn other(&self) -> &Self {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         pub fn head(&self) -> &Node<T> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `head_mut`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:105:9
[INFO] [stderr]     |
[INFO] [stderr] 105 |         pub fn head_mut(&mut self) -> NodeRefMut<T> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:232:9
[INFO] [stderr]     |
[INFO] [stderr] 232 |         pub fn get_mut(&mut self, p: Ptr<T>) -> &mut T {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sentinel`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:295:9
[INFO] [stderr]     |
[INFO] [stderr] 295 |         pub fn sentinel(&self) -> Ptr<Node<T>> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `tail`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:301:9
[INFO] [stderr]     |
[INFO] [stderr] 301 |         pub fn tail(&self) -> Ref<Node<T>> {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:304:9
[INFO] [stderr]     |
[INFO] [stderr] 304 |         pub fn is_empty(&self) -> bool {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `push_front`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |         pub fn push_front(&mut self, value: T) {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 29 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary `unsafe` block
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:322:13
[INFO] [stderr]     |
[INFO] [stderr] 322 |             unsafe {
[INFO] [stderr]     |             ^^^^^^ unnecessary `unsafe` block
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]    --> src/test03_two_nodes_graph.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |         pub fn value(&self) -> &T {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Graph`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 |     struct Graph<'a, T> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `nodes`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |         nodes: Arena<Node<T>>,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `value`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:68:9
[INFO] [stderr]    |
[INFO] [stderr] 68 |         pub fn value(&self) -> &T {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `other`
[INFO] [stderr]   --> src/test07_nodes_in_arena.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |         pub fn other(&mut self) -> Self {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]    --> src/test07_nodes_in_arena.rs:232:9
[INFO] [stderr]     |
[INFO] [stderr] 232 |         pub fn get_mut(&mut self, p: Ptr<T>) -> &mut T {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.40s
[INFO] running `"docker" "inspect" "dc2ad57222e02a725880fdc62cb3d2617ce69a2aa260002c6e137d32f539c44c"`
[INFO] running `"docker" "rm" "-f" "dc2ad57222e02a725880fdc62cb3d2617ce69a2aa260002c6e137d32f539c44c"`
[INFO] [stdout] dc2ad57222e02a725880fdc62cb3d2617ce69a2aa260002c6e137d32f539c44c